Then i'm afraid you have failed, some people will always believe that coal is white even when its shown them and its quite clearly black. Yet there are some people that are so close minded that they cannot accept things that are trivial in comparision to religion.
A saying for you Zak - one that holds very true in life so far i've found, and yes it is from the bible. I've changed it slightly as i've found it holds more true to me.
"Please let me have serenity to accept the things I cannot change. Courage to change the things I can and the wisdom to know the difference between."
Accept that there are some things you can't change, but don't let it worry you, just focus on the things that you can.
TiG